from The Century Dictionary and Cyclopedia

n. a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar

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The moonstone is another example of this peculiar feature which is possessed in a more or less degree by all the stones in the class of pellucid jewels, but no stone or gem can in any way even rival the curious mixture of opaqueness, translucency, silkiness, milkiness, fire, and the steadfast changeable and prismatic brilliance of colour of the precious opal.

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also Moonstone Moonstone glass, manufactured by Anchor Hocking, is a somewhat opaque white color. It is commonly found in hobnail with the bumps being solid white and the smooth glass part being more opaque. It was made in the 1930s and 1940s. Whole table settings were manufactured including several serving pieces. Candy dishes, flower vases and candle stick holders were also made in this pattern and color.